Add regplot

[hanjinliu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.25592% with 29 lines in your changes missing coverage. Please review.

Project coverage is 83.93%. Comparing base (2eb4e76) to head (d03ed13).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
whitecanvas/layers/tabular/_marker_like.py	64.44%	12 Missing and 4 partials ⚠️
whitecanvas/layers/_primitive/markers.py	50.00%	5 Missing and 4 partials ⚠️
whitecanvas/layers/group/line_band.py	90.47%	1 Missing and 1 partial ⚠️
whitecanvas/layers/tabular/_dataframe.py	98.18%	0 Missing and 1 partial ⚠️
whitecanvas/layers/tabular/_df_compat.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   83.91%   83.93%   +0.01%     
==========================================
  Files         198      198              
  Lines       22476    22639     +163     
  Branches     3717     2473    -1244     
==========================================
+ Hits        18861    19001     +140     
- Misses       2641     2662      +21     
- Partials      974      976       +2     

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